Carrier 42QTD012DS Series User manual

SERVICE MANUAL
12 18 24K
LIGHT COMMERCIAL

Cassette indoor unit
12 18K
24K
42QTD012DS
42QTD018DS
42QTD024DS
Under-ceiling indoor unit
42QZL018DS
42QZL024DS
Ducted indoor unit
42QSM012DS
42QSM018DS
42QSM024DS
Universal outdoor unit
38QUS012DS
38QUS018DS
38QUS024DS

INDEX
PART1 GENERAL INFORMATION
PART1.1 DUCTED
PART1.2 CASSETTE
PART1.3 UNDERCEILING
PART1.4 OUTDOOR UNIT
PART2 ELECTRICAL DIAGRAM
PART3 TROUBLE SHOOTING

PART – 1
GENERAL INFORMATION
Part 1.1 DUCTED
Part 1.2 CASSETTE
Part 1.3 UNDER-CEILING
Part 1.4 OUTDOOR UNIT

2
PRODUCT LINEUP

3
UNIT MODEL INDENTIFICATION

PART – 1
GENERAL INFORMATION
1.1 DUCT

1
DIMENSIONS
A
C
B
D
J
I
K
Air filter ( optional ) air inlet from rear side
air inlet from bottom side
FE
G
H
Electric control box
Air filter ( optional )
L
4-install hanger
Gas side
Liquid side
M
W1
W2
H1
H2
25 Drain connecting pipe
( for pump )
Test mouth & Test cover
Fresh air intake
25 Drain pipe
25 Drain pipe
Note: standard product without filter Unit: mm
Model
Outline dimension(mm) Air outlet opening size Air return opening size
Size of install
hanger
Size of refrigerant pipe
A B C D E F G H I J K L M H1 H2 W1 W2
42QSM012DS* 700 210 635 570 65 493 35 119 595 200 80 740 350 120 143 95 150
42QSM018DS* 920 210 635 570 65 713 35 119 815 200 80 960 350 120 143 95 150
42QSM024DS* 920 270 635 570 65 713 35 179 815 260 20 960 350 120 143 95 150
Fresh air intake joint

2
INSTALLTION SPACE

3
STATIC PRESSURE

4
STATIC PRESSURE - 42QSM012DS

5
STATIC PRESSURE - 42QSM018DS

6
STATIC PRESSURE - 42QSM024DS

7
DISASSEMBLY INSTRUCTION
No. Parts name Procedures Remarks
1 Remove the
electronic
control box
1) Screw off the screws to
remove the cover of
electronic control box
2) Disconnect the fan motor
wire, fan capacity wire,
room temperature sensor
wire and evaporator
temperature sensor wire
3) Screw off the screws to
remove electronic
control box
2 Remove the
display
board
1) Remove the cover of
electronic control box
Repeat the operation of step1 of No1
2) Disconnect the display
board wire connected to
PCB
3) Remove the sticker
3
）
Move the display board
according to the arrow
direction to disassemble
it.
Four screws
Connector
Plug of room
temperate sensor
and evaporator
temperature sensor
Fan motor wire
Sticker
2 screws
Fan capacity wire

8
3 Remove the
PCB 1) Remove the cover of electronic control box Repeat the operation of step1 of No1
1) Pull out all the plugs
or connectors connected
to the PCB and remove
the ground wire after
remove the screw.
2) Remove the PCB from
the electronic control
box
4 Remove the
fan
capacitor
1) Remove the cover of
electronic control box Repeat the operation of step1 of No1
2) Disconnect the fan
capacity wire. Repeat the operation of step2 of No1
3) Screw off the screw to
remover it
5 Remover
the fan
motor
1) Screw off the fixing
screws to remove the
rear cover board
Press the four
fixing holders
from four
corners to
remove the
PCB
1 screw
5 screws
Rear cover board
PCB

9
2) Screw off the fixing
screws to remove the
rear beam
3) Remove room
temperature sensor
4) Remove the sticker
5) Remove the below volute
shell
6) Remove the fan motor
wire from the electronic
control box
Refer the operation of step2 of No.1
7) Disassemble the fan
motor fixing clamps to
remove the fan motor
assembly and fan wheel
assembly
8) Disassemble the fan
wheels, then you can
remove the fan motor
6 Remove the
water
collector
assembly
1) Remove the rear cover
board Repeat the operation of step1 of No.5
2) Screw off the screws to
remove the water
collector assembly
4 screws
Press the clips to take off the volute shell
Press
Press
Rear beam
Total four screws at the left side and right side
The fan motor
assembly and
fan wheel
assembly can be
removed after
took off the
2screws used to
fix the fan motor
holder.
Take off the screw to remove the fan wheel
Cut off the fastening
belt to take off the
room temperature
sensor
Stickers

10
7 Remove the
evaporator 1) Remove the water collector Repeat the operation of No.6
2) Remove the evaporator
sensor
3) Remove the pipe clamp
board
4) Remove the evaporator
support board
3 screws
3 screws
3 screws
Evaporator
sensor
2 screws
4 screws
Water
collector
assembly

11
5) Screw off the fixing
screws to remove the
evaporator
1 screw

PART – 1
GENERAL INFORMATION
1.2 CASEETTE

1
DIMENSIONS – 12 18K
Panel
Gas side
Liquid side
4-install hanger
Body
Drain pipe32
Fresh air intake
65
647
647
50
Drain hole
( for Service )
545
570 260
68
42
157
126
44
Wiring connection port
75
150 Distribution duct
2-
E-parts box
4-Screw hole
(for install panel)
523
570
Wiring connection port
170
2-